Question

In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have positive potential, and points outside S have negative potential. A positive charge, which is free to move, is placed inside S.

• A. It will remain in equilibrium
• B. It can move inside S, but is cannot cross S.
• C. It must cross S at some time.
• D. It may move, but will ultimately return to its starting point.

Answer 1

Answer: (C)

It must cross S at some time.